Display Device with Novel Sub-pixel Arrangement

ABSTRACT

A display device includes a plurality of sub-pixel groups, wherein each of the plurality sub-pixel groups comprises eight sub-pixels disposed in a row direction or in a column direction and the eight sub-pixels comprise two red sub-pixels; two blue sub-pixels; two green sub-pixels; and two sub-pixels of a predetermined color, wherein in each of the plurality of sub-pixel groups, a distance between the red sub-pixels or between the blue sub-pixels is less than a distance between the green sub-pixels or between the sub-pixels of the predetermined color, and the sub-pixels of the predetermined color have a luminance higher than a luminance of the red sub-pixels and the blue sub-pixels.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 15/168,090, filed on May 29, 2016, the contents of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a display device, and moreparticularly, to a display device with a novel sub-pixel arrangement.

2. Description of the Prior Art

A liquid crystal display (LCD) is a flat panel display which has theadvantages of low radiation, light weight and low power consumption andis widely used in various information technology (IT) products, such asnotebook computers, personal digital assistants (PDA), and mobilephones. An active matrix thin film transistor (TFT) LCD is the mostcommonly used transistor type in LCD families, and particularly in thelarge-size LCD family. A driving system installed in the LCD includes atiming controller, source drivers and gate drivers. The source and gatedrivers respectively control data lines and scan lines, which intersectto form a cell matrix. Each intersection is a cell including crystaldisplay molecules and a TFT. In the driving system, the gate drivers areresponsible for transmitting scan signals to gates of the TFTs to turnon the TFTs on the panel. The source drivers are responsible forconverting digital image data, sent by the timing controller, intoanalog voltage signals and outputting the data voltage signals tosources of the TFTs.

In recent years, the requirement of the image quality gradually growsand pixels per inch (PPI) of the LCD keeps increasing to achieve theimage quality. Meanwhile, the light transmittance of the LCD paneldecreases when PPI increases. In conventional arts, white pixels areadded for improving entire light transmittance of the LCD panel, andsub-pixel rendering (SPR) technique is also applied to enhance theaperture ratio of sub-pixels. Unfortunately, red/green/blue sub-pixelarea is reduced along with adding white sub-pixels and the luminance ofred/green/blue sub-pixels is degraded as a result, which also decreasesthe perceived brightness of the LCD panel.

SUMMARY OF THE INVENTION

In order to solve the above problem, the present invention provides adisplay device with a novel sub-pixel arrangement.

In an aspect, the present invention discloses a display device. Thedisplay device comprises a plurality of sub-pixel groups, wherein eachof the plurality sub-pixel groups comprises eight sub-pixels disposed ina row direction or in a column direction. The eight sub-pixels of eachof the plurality of sub-pixel groups comprise two red sub-pixels, twoblue sub-pixels, two green sub-pixels, and two sub-pixels of apredetermined color. In each of the plurality of sub-pixel groups, adistance between the red sub-pixels or between the blue sub-pixels isless than a distance between the green sub-pixels or between thesub-pixels of the predetermined color, and the sub-pixels of thepredetermined color have a luminance higher than a luminance of the redsub-pixels and the blue sub-pixels.

By adopting the sub-pixel arrangement of the present invention, not onlythe visually perceived brightness of the display device is increased,but also the luminance of lower luminance colors displayed by thedisplay device is enhanced.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a display device according to anexample of the present invention.

FIG. 2 is a schematic diagram of the repeatedly arranged sub-pixel groupshown in FIG. 1.

FIG. 3 is a schematic diagram of the repeatedly arranged sub-pixel groupshown in FIG. 1.

FIGS. 4A and 4B are schematic diagram of polarity arrangement of therepeatedly arranged sub-pixel group shown in FIG. 1.

FIG. 5A is a schematic diagram of red sub-pixels of the repeatedlyarranged sub-pixel group shown in FIG. 1 operating in different modes.

FIG. 5B is a schematic diagram of blue sub-pixels of the repeatedlyarranged sub-pixel group shown in FIG. 1 operating in different modes.

FIG. 5C is a schematic diagram of green sub-pixels of the repeatedlyarranged sub-pixel group shown in FIG. 1 operating in different modes.

FIG. 5D is a schematic diagram of predetermined colored sub-pixels ofthe repeatedly arranged sub-pixel group shown in FIG. 1 operating indifferent modes.

FIG. 6 is a schematic diagram of a display device according to anexample of the present invention.

FIG. 7 is a schematic diagram of a display device according to anexample of the present invention.

FIG. 8 is a schematic diagram of a display device according to anexample of the present invention.

FIG. 9 is a schematic diagram of the repeatedly arranged sub-pixel groupshown in FIG. 8.

FIG. 10 is a schematic diagram of the repeatedly arranged sub-pixelgroup shown in FIG. 8.

FIG. 11 is a schematic diagram of a display device according to anexample of the present invention.

FIG. 12 is a schematic diagram of a display device according to anexample of the present invention.

DETAILED DESCRIPTION

Please refer to FIG. 1, which is a schematic diagram of a display device10 according to an example of the present invention. The display device10 may be an electronic product with a liquid crystal panel, such as atelevision, a smart phone or a tablet, and is not limited herein. FIG. 1only shows parts of sub-pixels of the display device 10 forillustrations. Note that, FIG. 1 is utilized for illustrating therelative positions of the sub-pixels and not for limiting the ratio oflength to width of each of sub-pixels. As shown in FIG. 1, the displaydevice 10 comprises a plurality of repeatedly arranged sub-pixel groupsRASG1 (only one repeatedly arranged sub-pixel group RASG1 is marked inFIG. 1 for simplicity). The repeatedly arranged sub-pixel group RASG1comprises sub-pixels of a predetermined color whose luminance is greaterthan that of red and blue, to increase the perceived brightness of thedisplay device 10. In an example, the predetermined color is white,yellow, cyan, or magenta. Further, a horizontal distance between thesub-pixels of a lower luminance color (i.e., red or blue) is smallerthan a horizontal distance between the sub-pixels of a higher luminancecolor (i.e., green or the predetermined color such as white), to enhancethe luminance of the lower luminance colors displayed by the displaydevice 10.

Please refer to FIG. 2, which is a schematic diagram of the repeatedlyarranged sub-pixel group RASG1 shown in FIG. 1. As shown in FIG. 2, therepeatedly arranged sub-pixel group RASG1 comprises adjacent sub-pixelgroups SPG1 and SPG2. The sub-pixel group SPG1 comprises sub-pixels R1,G1, R2, W1, B1, G2, B2, W2 disposed in a row direction (e.g. thehorizontal direction) from left to right at a first row. The sub-pixelgroup SPG2 comprises sub-pixels B3, W3, B4, G3, R3, W4, R4, G4 disposedin the row direction from left to right at a second row adjacent to thefirst row. As can be seen from FIGS. 1 and 2, the display device 10 canbe realized by repeatedly disposing the sub-pixel groups SPG1 and SPG2.

In the repeatedly arranged sub-pixel group RASG1, the sub-pixels R1-R4are red sub-pixels, the sub-pixels G1-G4 are green sub-pixels, thesub-pixels W1-W4 are sub-pixels of the predetermined color, and thesub-pixels B1-B4 are blue sub-pixels. That is, each of the sub-pixelgroups SPG1 and SPG2 comprises 2 red sub-pixels, 2 green sub-pixels, 2blue sub-pixels, and 2 sub-pixels of the predetermined color. Thepredetermined color may be white or any color except the pure red, greenand blue, and the luminance of the predetermined color sub-pixel isgreater than the luminance of red sub-pixel and the luminance of bluesub-pixel.

Note that, the adjacent sub-pixels in the repeatedly arranged sub-pixelgroup RASG1 are not corresponding to the same color. For example, thehorizontally adjacent sub-pixels in each of the sub-pixel groups SPG1and SPG2 have different colors and the vertically adjacent sub-pixelsrespectively in the sub-pixel groups SPG1 and SPG2 have differentcolors. Because the predetermined color is a relatively high luminancecolor, the brightness of the display device 10 is increased by addingthe sub-pixels W1-W4 of the predetermined color.

However, the areas of the sub-pixels of red, green and blue aredecreased when adding the sub-pixels of the predetermined color,resulting that the luminance of red, green, or blue displayed by thedisplay device 10 becomes lower. In order to increase the luminance ofred and blue, which are of relatively lower luminance than green, thetwo sub-pixels of red or blue are arranged in a closer distance than thedistance between the two sub-pixels of green or the predetermined color.As shown in FIG. 2, the distance between the sub-pixels R1 and R2 orbetween the sub-pixels B1 and B2 is 2 WS, which is twice a unitsub-pixel width WS, and the distance between the green sub-pixels G1 andG2 or between the sub-pixels W1 and W2 of the predetermined color is 4WS. The luminance of red and blue displayed by the display device 10therefore can be enhanced by narrowing the distance between the redsub-pixels R1 and R2 or between the blue sub-pixels B1 and B2.

In the example shown in FIG. 2, a unit sub-pixel width (WS) may bedefined as the distance between the center points of the two adjacentsub-pixels in the row direction, or defined as the width of a sub-pixelincluding necessary routing area associated with the sub-pixel.

As to the relationships between the pixels and the sub-pixels R1-R4,G1-G4, W1-W4, and B1-B4 in the repeatedly arranged sub-pixel groupRASG1, please refer to FIG. 3. The sub-pixels R1 and G1 arecorresponding to a pixel P1, the sub-pixels R2 and W1 are correspondingto a pixel P2, and so on. In FIG. 3, each of the pixels P1-P8 comprises2 sub-pixels, i.e., the sub-pixel rendering (SPR) ratio is 1:2.According to different applications and design concepts, the number ofthe sub-pixels in each of pixels (i.e., the SPR ratio) maybe altered. Aslong as the number of sub-pixels disposed in the row direction is amultiple of 8 (i.e. the multiple of the number of the sub-pixelsdisposed in the row direction in the repeatedly arranged sub-pixel groupRASG1), the display device 10 can be realized by the repeatedly arrangedsub-pixel group RASG1 no matter what the SPR ratio of the display device10 is. For example, the SPR ratio of the display device 10 may be 1:3 or1:4, and is not limited herein.

Further, the sub-pixels with the same color in each of the sub-pixelgroups SPG1 and SPG2 are corresponding to different polarities. Pleaserefer to FIGS. 4A and 4B, which are schematic diagrams of polarityarrangement of the repeatedly arranged sub-pixel group RASG1 shown inFIG. 2. In the repeatedly arranged sub-pixel group RASG1 shown in FIG.4A, the sub-pixels of the same column (i.e. vertically adjacentsub-pixels) are corresponding to the same polarity. In the sub-pixelgroup SPG1, the red sub-pixel R1 is corresponding to a positive polarityand the red sub-pixel R2 is corresponding to a negative polarity, thegreen sub-pixel G1 is corresponding to the negative positive polarityand the green sub-pixel G2 is corresponding to the positive polarity,and so on. In other words, the sub-pixels with the same color in thesub-pixel groups SPG1 and SPG2 are corresponding to differentpolarities. The horizontal crosstalk phenomena in the display device 10can be reduced because the polarity of each of the sub-pixels isdifferent from that of at least one of horizontally adjacent sub-pixels.

In FIG. 4B, the polarity of each of the sub-pixels is inverted from thatshown in FIG. 4A. The red sub-pixel R1 is corresponding to the negativepolarity and the red sub-pixel R2 is corresponding to the positivepolarity, the green sub-pixel G1 is corresponding to the positivepolarity and the green sub-pixel G2 is corresponding to the negativepolarity, and so on. Since the polarity of each of the sub-pixels isdifferent from that of at least one of horizontally adjacent sub-pixels,the horizontal crosstalk phenomena in the display device 10 can bereduced.

When adopting the sub-pixel arrangement shown in FIG. 2, the repeatedlyarranged sub-pixel group RASG1 may operate in different operation modesto display colors. In an embodiment, a pixel Px in the repeatedlyarranged sub-pixel group RASG1 displays a color component, such as redcolor, by only one red sub-pixel, which may be a red sub-pixel of thepixel Px if the pixel Px itself has it, or alternatively, a redsub-pixel of a neighbor pixel no matter the pixel Px itself has the redsub-pixel or not. In another embodiment, the pixel Px displays a colorcomponent, such as red, by not only a red sub-pixel of the pixel Px butalso an another red sub-pixel (in a neighbor pixel) close to the pixelPx.

Please refer to FIG. 5A, which is a schematic diagram of red sub-pixelsin the repeatedly arranged sub-pixel group RASG1 operating in differentmodes M1, M2, M3 and M4. In FIG. 5A, the pixel P1 and its neighbor pixelP2 are referred as an example. In the operation mode Ml, the pixel P1displays red component by the red sub-pixel R1 of the pixel P1 lightenedwith X % of the maximum luminance, wherein 50≤X≤100 for example, oralternatively, by the red sub-pixel R2 of the pixel P2 lightened with X% of the maximum luminance instead of the red sub-pixel R1 of the pixelP1. Note that the maximum luminance depends on different colorcomponent. The maximum luminance of red sub-pixels may be different fromthe maximum luminance of blue or green sub-pixels.

In the operation mode M2, the pixel P1 displays red component by the redsub-pixel R1 lightened with Y % of the maximum luminance and the redsub-pixel R2 lightened with Y % of the maximum luminance, wherein0≤Y≤50, for example. Therefore, the luminance of red component of thepixel P1 is enhanced by the red sub-pixel R2 of the pixel P2. In theabove examples, if Y is equal to 0.5*X, the visually perceivedbrightness of the red component displayed in the operation modes M1 andM2 in the above examples are approximately the same because the redsub-pixel R1 and the red sub-pixel R2 are disposed as close as possible.

In the operation mode M3, the pixel P1 displays red component by the redsub-pixel R1 lightened with X % of the maximum luminance and the redsub-pixel R2 lightened with Y % of the maximum luminance, wherein50≤X≤100 and 0≤Y≤50, for example; Alternatively, the pixel P1 displaysred component by the red sub-pixel R1 lightened with Y % of the maximumluminance and the red sub-pixel R2 lightened with X % of the maximumluminance. Therefore, the luminance of red component of the pixel P1 isenhanced by the red sub-pixel R2 of the pixel P2. Under such a conditionof the operation mode M3, the luminance of red component displayed bythe pixel P1 may exceed the originally designed X % of maximum luminanceof single sub-pixel.

The operation mode M4 is similar to the operation mode M2 but both thered sub-pixels R1 and R2 in the adjacent pixels P1 and P2 are lightenedwith X % of the maximum luminance, wherein 50≤X≤100. In the operationmode M4, the luminance of red component of a pixel is further increased,compared to the operation mode M2.

Please refer to FIG. 5B, which is a schematic diagram of blue sub-pixelsin the repeatedly arranged sub-pixel group RASG1 operating in fourdifferent operation modes M1-M4. In FIG. 5B, the pixel P5 and itsneighbor pixel P6 are referred as an example, and the luminance of theblue sub-pixels B3 and B4 may be controlled in the same behaviors as theoperation mode M1, M2, M3 or M4 in the example of FIG. 5A. According tothe operation mode M1, the pixel P5 displays blue component by eitherthe blue sub-pixel B3 or the blue sub-pixel B4. According to theoperation mode M2, M3 or M4, the pixel P5 displays blue component byboth of the blue sub-pixel B3 and the blue sub-pixel B4 and as a result,the luminance of blue component displayed by the pixel P5 may beenhanced.

FIG. 5C is a schematic diagram of green sub-pixels in the repeatedlyarranged sub-pixel group RASG1 operating in different operation modesM1-M4. In the example of FIG. 5C, the pixel P1 and it neighbor pixel P6are referred as an example, and the luminance of the green sub-pixels G1and G3 may be controlled in the same behaviors as the operation mode M1,M2, M3 or M4 in the example of FIG. 5A. According to the operation modeM1, the pixel P1 displays green component by either the green sub-pixelG1 or the green sub-pixel G3. According to the operation mode M2, M3 orM4, the pixel P1 displays green component by both of the green sub-pixelG1 and the green sub-pixel G3 and as a result, the luminance of greencomponent displayed by the pixel P1 may be enhanced.

FIG. 5D is a schematic diagram of white sub-pixels in the repeatedlyarranged sub-pixel group RASG1 operating in different operation modesM1-M4. In the example of FIG. 5D, the pixel P2 and it neighbor pixel P5are referred as an example, and the luminance of the predeterminedcolored (e.g., white) sub-pixels W1 and W3 may be controlled in the samebehaviors as the operation mode M1, M2, M3 or M4 in the example of FIG.5A.

Based on the operation mode M2, M3 or M4, when a pixel displays pure redor pure blue, the luminance of pure red or pure blue can be significantenhanced by additionally lightening a sub-pixel of the same color in aneighbor pixel. It should be noticed that the smaller distance (2 WS inFIG. 2) between two red sub-pixels or two blue sub-pixels helpsrealization of the operation mode M2, M3 or M4. Besides, the operationmodes M2-M4 are not limited to display pure red/blue/green.

Note that, the display device 10 is not limited to be consisted of therepeated arranged sub-pixel group RASG1, sub-pixel group SPG1 or SPG2.Please refer to FIG. 1, a repeated arranged sub-pixel group RASG2consisting of the sub-pixel groups SPG3 and SPG4 also can be regarded asa repeated arranged sub-pixel group of the display device 10. Thesub-pixel group SPG3 can be regarded as a modified sub-pixel group SPG1by interchanging the positions of red sub-pixels and the positions ofblue sub-pixels in the sub-pixel group SPG1; and in another perspective,the sub-pixel group SPG3 can also be regarded as a modified sub-pixelgroup SPG2 by interchanging the positions of green sub-pixels and thepositions of sub-pixels of the predetermined color in the sub-pixelgroup SPG2. Similarly, the sub-pixel group SPG4 can be regarded as amodified sub-pixel group SPG2 by interchanging the positions of redsub-pixels and the positions of blue sub-pixels in the sub-pixel groupSPG2; in another perspective, the sub-pixel group SPG4 can also beregarded as a modified sub-pixel group SPG1 by interchanging thepositions of green sub-pixels and the positions of sub-pixels of thepredetermined color in the sub-pixel group SPG2.

Please refer to FIG. 6, which is a schematic diagram of a display device60 according to an example of the present invention. In comparison withthe display device 10 shown in FIG. 1, a vertical displacement VD1exists between the sub-pixels of odd columns and the sub-pixels of evencolumns. In other words, the vertical displacement VD1 exists betweenthe horizontal adjacent sub-pixels disposed in each of the sub-pixelgroups SPG1 and SPG2, whose sub-pixels are disposed in the rowdirection. In this example, the vertical displacement VD1 is smallerthan or equal to half the vertical length of each sub-pixel.

Please refer to FIG. 7, which is a schematic diagram of a display device70 according to an example of the present invention. Different from thedisplay device 10 shown in FIG. 1, the display device 70 has ahorizontal displacement HD1 between the sub-pixels of odd rows and thesub-pixels of even rows. That is, the horizontal displacement HD1 existsbetween two vertical adjacent sub-pixels respectively disposed in eachof the sub-pixel groups SPG1 and SPG2, whose sub-pixels are disposed inthe row direction. In this example, the horizontal displacement HD1 issmaller than or equal to half the width WS of each sub-pixel.

According to different applications and design concepts, the sub-pixelsin each of the sub-pixel groups may be disposed in a column (e.g.vertical) direction. Please refer to FIG. 8, which is a schematicdiagram of a display device 80 according to an example of the presentinvention. The display device 80 may be an electronic product with aliquid crystal panel, such as a television, a smart phone or a tablet,and is not limited herein. FIG. 8 only shows parts of sub-pixels of thedisplay device 90 for illustrations. Note that, FIG. 8 is utilized forillustrating the relative positions of the sub-pixels and not forlimiting the ratio between length and width of each of sub-pixels. Asshown in FIG. 8, the display device 80 comprises a plurality ofrepeatedly arranged sub-pixel groups RASG3 (only one repeatedly arrangedsub-pixel group RASG3 is marked in FIG. 8 for simplicity). Therepeatedly arranged sub-pixel group RASG3 comprises sub-pixels of thepredetermined color whose luminance is greater than the luminance of redsub-pixels and the luminance of blue sub-pixels, to increase theperceived brightness of the display device 80. For example, thepredetermined color is white. Further, the distance between the lowerluminance sub-pixels (i.e., red or blue) in the vertical direction issmaller than the distance between the higher luminance sub-pixels (e.g.,green or the predetermined color) in the vertical direction, to enhancethe luminance of the lower luminance colors displayed by the displaydevice 80.

Please refer to FIG. 9, which is a schematic diagram of the repeatedlyarranged sub-pixel group RASG3 shown in FIG. 8. As shown in FIG. 9, therepeatedly arranged sub-pixel group RASG3 comprises adjacent sub-pixelgroups SPG5 and SPG6. The sub-pixel group SPG5 comprises sub-pixels R1,G1, R2, W1, B1, G2, B2, and W1 disposed in a column direction (e.g.vertical direction) from top to bottom at a first column. The sub-pixelgroup SPG6 comprises sub-pixels B3, W3, B4, G3, R3, W4, R4, and G4disposed in the column direction from top to bottom at a second columnadjacent to the first column. As can be seen from FIGS. 8 and 9, thedisplay device 80 can be realized by repeatedly disposing the sub-pixelgroups SPG5 and SPG6.

In the repeatedly arranged sub-pixel group RASG3, the sub-pixels R1-R4are red sub-pixels, the sub-pixels G1-G4 are green sub-pixels, thesub-pixels W1-W4 are sub-pixels of the predetermined color, and thesub-pixels B1-B4 are blue sub-pixels. That is, each of the sub-pixelgroups SPG5 and SPG6 comprises 2 red sub-pixels, 2 green sub-pixels, 2blue sub-pixels, and 2 sub-pixels of the predetermined color. Note that,the horizontally adjacent sub-pixels respectively disposed in thesub-pixel groups SPG5 and SPG6 have different colors. Since theluminance of the predetermined color is greater than the luminance ofred sub-pixels and the luminance of blue sub-pixels, the perceivedbrightness of the display device 80 is increased by adding thesub-pixels W1-W4 of the predetermined color.

In FIG. 9, the distance (in vertical direction) between the sub-pixelsR1 and R2 or between the sub-pixels B1 and B2 is 2 WS, and the distance(in vertical direction) between the sub-pixels G1 and G2 or between thesub-pixels W1 and W2 is 4 WS. Under such a condition, the luminance ofred sub-pixels or blue sub-pixels displayed by the display device 80 canbe enhanced when the red and blue sub-pixels are lightened according tobehaviors similar to the operation mode M2, M3, or M4 illustrated inFIGS. 5A and 5B. Also, the green sub-pixels and the predeterminedcolored sub-pixels can be lightened according to behaviors similar tothe operation mode M2, M3, or M4 illustrated in FIGS. 5C and 5D.

As to the relationships between the pixels and the sub-pixels R1-R4,G1-G4, W1-W4, and B1-B4 in the repeatedly arranged sub-pixel groupRASG3, please refer to FIG. 10. In a SPR ratio 1:2, the sub-pixels R1and G1 are corresponding to a pixel P1, the sub-pixels R2 and W1 arecorresponding to a pixel P2, and so on. According to differentapplications and design concepts, the number of the sub-pixels in eachof pixels (i.e., the SPR ratio) may be altered. As long as the number ofsub-pixels disposed in the column direction is a multiple of 8 (i.e.,the multiple of the number of the sub-pixels disposed in the columndirection in the repeatedly arranged sub-pixel group RASG3), the displaydevice 80 can be realized by the repeatedly arranged sub-pixel groupRASG3 no matter what the SPR ratio of the display device 80 is.

Please refer to FIG. 11, which is a schematic diagram of a displaydevice 110 according to an example of the present invention. Differentfrom the display device 80 shown in FIG. 8, the display device 110 has avertical displacement VD2 between the sub-pixels of odd columns and thesub-pixels of even columns. In other words, the vertical displacementVD2 exists between two adjacent sub-pixel groups SPG5 and SPG6, whosesub-pixels are disposed in the column direction. In this example, thevertical displacement VD2 is smaller than or equal to half the sub-pixelwidth WS.

Please refer to FIG. 12, which is a schematic diagram of a displaydevice 120 according to an example of the present invention. Incomparison with the display device 80 shown in FIG. 8, a horizontaldisplacement HD2 exists between the sub-pixels of odd rows and thesub-pixels of even rows. That is, the horizontal displacement HD2 existsbetween two vertically adjacent sub-pixels in each of the sub-pixelgroups SPG5 and SPG6, whose sub-pixels are disposed in the columndirection. In this example, the horizontal displacement HD2 is smallerthan or equal to half the horizontal length of a single sub-pixel.

The display devices of the above examples are realized by a novelsub-pixel position arrangement. By adopting the novel sub-pixel positionarrangement, the luminance of lower luminance colors displayed by thedisplay device is enhanced and thereby the perceived brightness of thedisplay device is improved.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A display device, comprising: a plurality ofsub-pixel groups, wherein each of the plurality of sub-pixel groupscomprises eight sub-pixels disposed in a row direction or in a columndirection and the eight sub-pixels comprise: two red (R) sub-pixels; twoblue (B) sub-pixels; two green (G) sub-pixels; and two sub-pixels of apredetermined color (X), wherein in each of the plurality of sub-pixelgroups, a distance between the red sub-pixels or between the bluesub-pixels is smaller than a distance between the green sub-pixels orbetween the sub-pixels of the predetermined color, and the sub-pixels ofthe predetermined color have a luminance higher than a luminance of thered sub-pixels and the blue sub-pixels; wherein along one of the rowdirection and the column direction, a repeatedly arranged color sequenceof the eight sub-pixels from left to right is R, G, R, X, B, G, B, X, orB, X, B, G, R, X, R, G, and sub-pixels of the same color in each of theplurality of sub-pixel groups are corresponding to different polarities;and wherein the plurality of sub-pixel groups comprises one of followingfour kinds of displacement: (1) a first horizontal displacement, betweentwo adjacent sub-pixels which are respectively disposed in two adjacentsub-pixel groups of the plurality of sub-pixel groups having sub-pixelsdisposed in the row direction, (2) a first vertical displacement,between two adjacent sub-pixels in each of the plurality of sub-pixelgroups having sub-pixels disposed in the row direction, (3) a secondhorizontal displacement between two adjacent sub-pixels in each of theplurality of sub-pixel groups having sub-pixels disposed in the columndirection, and (4) a second vertical displacement exists between twoadjacent sub-pixels which are respectively disposed in two adjacentsub-pixel groups of the plurality of sub-pixel groups having sub-pixelsdisposed in the column direction.
 2. The display device of claim 1,wherein the plurality of sub-pixel groups comprises a first sub-pixelgroup and an adjacent second sub-pixel group, and every two adjacentsub-pixels respectively disposed in the first sub-pixel group and thesecond sub-pixel group are corresponding to different colors.
 3. Thedisplay device of claim 1, wherein a pixel displays red component orblue component by not only a red or blue sub-pixel of the pixel but alsoanother sub-pixel of the same color of a neighbor pixel, and the pixeland the neighbor pixel are in the same sub-pixel group.
 4. The displaydevice of claim 1, wherein a pixel displays green component or thepredetermined color component by not only a green sub-pixel or apredetermined-colored sub-pixel of the pixel but also another sub-pixelof the same color of a neighbor pixel, and the pixel and the neighborpixel are in different sub-pixel groups.